IP subnet-zero , can a broadcast subnet address be used

Andrew NewmanAndrew Newman Posts: 23Member ■□□□□□□□□□
Hi, In question 1 of the chapter 15 quiz of the CCent ICND1 book, it says that 10.43.53.255 /26 cannot be used as a host address even though the ip subnet-zero command has been configured. Earlier on in the book it says that using the ip subnet-zero command means that the subnet number and the broadcast subnet are not reserved and can be used as host IP addresses. Can anybody clear this up for me?

Comments

  • phoeneousphoeneous Posts: 2,329Member
    Read this: Subnet Zero and the All-Ones Subnet  [IP Addressing Services] - Cisco Systems

    .255 is the broadcast of that subnet range. Although technically you could use it, it isn't recommended because of potential addressing conflicts.
  • Andrew NewmanAndrew Newman Posts: 23Member ■□□□□□□□□□
    Hi phoeneous, thanks for replying. If asked a similar question on the actual CCent exam, can I take it that the all-the-ones subnet is NEVER used even though the ip subnet-zero command has been configured?
  • prtechprtech Posts: 163Member
    10.43.53.255 is not an all-ones subnet, it's not even a subnet. It's a broadcast address, and they cannot be applied to hosts.
    If at first you do succeed, try something harder.
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